This is a merged information page for Item #2375.
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Pololu item #:
2375
Brand:
Power HD
Status:
Discontinued
The Power HD 1235MG servo is all about torque. This 1/4-scale servo can deliver an incredible 560 oz-in of torque at 7.4 V or 490 oz-in at 6 V, and it features an all-metal gear train, digital control electronics, and two ball bearings on the output shaft. Unlike typical hobby servos, the 1235MG has an operating voltage range of 6 V to 7.4 V. Servo horns and associated hardware are included.
Key specs at 7.4 V: 0.18 sec/60°, 560 oz-in (40 kg-cm), 170 g.
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Power HD ultra-high-torque, high-voltage digital giant servo HD-1235MG. |
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Power HD digital giant servo 1235MG (left) next to a Power HD high-torque standard-size servo 1501MG (right), with a US quarter for size reference. |
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Power HD ultra-high-torque, high-voltage digital giant servo HD-1235MG with included hardware (actual hardware might vary). |
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Gears and ball bearings of the Power HD 1235MG giant servo. |
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Metal servo horn on a Power HD giant servo HD-1235MG. |
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The FEETECH FT5335M and Power HD 1235MG giant servos have very similar dimensions and performance. |
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The HD-1235MG is a giant-scale (also called 1/4-scale or mega-scale) digital servo from Power HD that can deliver more than twice the torque of our strongest standard-size servo, offering up to 560 oz-in at 7.4V or 490 oz-in at 6 V (if you need even more torque than this, check out the much larger Torxis monster servos). The picture on the right shows how the giant-size 1235MG compares to our popular 1501MG standard-size servo.
The entire gear train is metal, and the output shaft is supported by two ball bearings for improved performance. Unlike typical hobby servos, the 1235MG has an operating voltage range of 6 V to 7.4 V. This servo works with standard RC servo pulses at frequencies up to 333 Hz. The 12″ (300 mm) lead is terminated with a standard “JR”-style connector, which is Futaba-compatible.
Note: This servo can draw a lot of current (e.g. the stall current is 9 A at 7.4 V), so please make sure you use an appropriate power supply. For comparison, a typical standard-size servo might draw around an amp when straining.
The picture below shows an example of the hardware that might be included with this servo (hardware might vary):
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The included servo horns are plastic, but we also carry a compatible metal horn (sold separately) that can be used as a more robust lever arm in ultra-high-torque applications:
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The picture below shows the all-metal gear train and ball bearings that help the servo deliver such high torque:
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Gears and ball bearings of the Power HD 1235MG giant servo. |
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You can find more information about this servo under the specifications tab and in its datasheet (382k pdf).
Note that, as with most hobby servos, stalling or back-driving this servo can damage it.
The FT5335M giant servo from FEETECH is a very similar, lower-cost alternative to 1235MG. The two servos are approximately the same size, though the mounting hole spacing differs between the two, and they have almost identical performance specifications. The output shaft of the 1235MG is supported by two ball bearings for reduced friction while the output shaft of the FT5335M is supported by bushings. The picture below shows both the FT5335M and the 1235MG side by side:
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The servo output splines have the same number of teeth, but the diameter of the one on the FT5335M is approximately 0.2 mm bigger. This means that the servo horns included with the FT5335M can be used with the 1235MG, but not the other way around.
| Size: | 59.5 × 29.5 × 54.3 mm |
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| Weight: | 170 g |
| Digital?: | Y |
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| Speed @ 7.4V: | 0.18 sec/60° |
| Stall torque @ 7.4V: | 40 kg·cm |
| Speed @ 6V: | 0.20 sec/60° |
| Stall torque @ 6V: | 35 kg·cm |
| Hardware included?: | Y |
| Lead length: | 12 in |
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Most standard radio control (RC) servos have three wires, each a different color. Usually, they are either black, red, and white, or they are brown, red, and orange/yellow:
Please check the specs for your servo to determine the proper power supply voltage, and please take care to plug the servo into your device in the proper orientation (plugging it in backwards could break the servo or your device).
Note: Some of the servos we carry also have an optional fourth green wire that is separate from the three standard ones. This wire provides access to the feedback potentiometer, allowing you to directly measure the position of the output. The servos with this extra wire have "with Position Feedback" at the ends of their product names. The picture below is an example of such a servo.
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FEETECH Sub-Micro Servo FS0403-FB with Position Feedback. |
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We do not specify the range of rotation of our servos because this information is not generally available from servo manufacturers. RC servos are usually intended for controlling things like the steering mechanism in an RC car or the flaps on an RC plane. Manufacturers make sure that the range is enough for these typical applications, but they do not guarantee performance over a wider range.
This means most RC servos will rotate about 90° using the standard 1–2 ms pulse range used by most RC receivers. However, if you are using a controller capable of sending a wider range of pulses, many servos can rotate through almost 180°.
You can find a servo’s limits if you use a servo controller that can send pulses outside of the standard range (such as our Maestro servo controllers). To find the limits, use the lowest possible supply voltage at which the servo moves, and gradually increase or decrease the pulse width until the servo does not move any further or you hear the servo straining. Once the limit is reached, immediately move away from it to avoid damaging the servo, and configure your controller to never go past the limit.
You might be wondering why we do not just follow the above steps for all the servos we carry and list a specification for degrees of rotation. Unfortunately, since servo manufacturers do not specify the range of rotation, it might change from one manufacturing run to the next. They will not inform us about changes that are not specified, and we have no way of knowing if or when they might change their manufacturing process.
For more information about servos and how to control them, we recommend the series of blog posts on servos starting with: Introduction to servos.
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We are now carrying metal servo horns that work with Power HD’s ultra-high-torque HD-1235MG giant servos, which can deliver a whopping 560 oz-in...
As you might have noticed from some of our recent blog announcements, we are steadily working on expanding our selection of hobby servos, and the...
